Next generation HVAC system for office buildings - The optimal control structure for DHC buildings -

The new air-conditioning control method for the energy saving of buildings is proposed. The method is mainly focused on the compatibility of energy savings and comfort. The energy saving is achieved through the optimal operation of HVAC (heating, ventilating and air-conditioning) system, manipulating the supplying airflow temperatures to the rooms, room temperatures and the humidity. The comfort is kept by the index (PMV: predicted mean vote) that comprises temperature, humidity, radiation temperature, wind velocity and so on. In order to find the HVAC system operation conditions that satisfy the comfort and energy saving at the same time, very large-scale nonlinear programming with nonlinear constraints must be solved on real time basis. To make the programming of the system practical, the driving function loaded onto a control computer is introduced. The function is made by the spline-interpolation to achieve calculation stable and adaptation to various HVAC operation modes.